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https://issues.apache.org/jira/browse/HBASE-17825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372915#comment-16372915
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Josh Elser commented on HBASE-17825:
------------------------------------

What are our compatibility guarantees on WALPlayer? The test failure makes me 
realize that if users are relying on output in a certain way, this change will 
break them. Not sure if this is something to be concerned about.

I assume you'll be looking at the other things QA called out, Vlad.

> Backup: further optimizations
> -----------------------------
>
>                 Key: HBASE-17825
>                 URL: https://issues.apache.org/jira/browse/HBASE-17825
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>            Priority: Critical
>              Labels: backup
>             Fix For: 3.0.0
>
>         Attachments: HBASE-17825-v1.patch, HBASE-17825-v2.patch, 
> HBASE-17825-v3.patch
>
>
> Some phases of backup and restore can be optimized:
> # WALPlayer support for multiple tables
> # Run DistCp once per all tables during backup/restore
> The eventual goal:
> # 2 M/R jobs per backup/restore



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